diff --git a/documentation/README.hpux b/documentation/README.hpux
index c03bbe38c..6c7287087 100644
--- a/documentation/README.hpux
+++ b/documentation/README.hpux
@@ -17,7 +17,7 @@ Tools needed
   - HP's ANSI C compiler (cc)
 
   - Recent version of HP's aCC C++ compiler aCC
-    (we currently use A.03.45; A.03.39 should also do)
+    (we currently use A.03.52; anything >= A.03.39 should also do)
     HP's old frontend-based C++ compiler (CC) will not work.
 
  o For compiling with the GNU compilers